An error might occur when trying to launch any Microsoft 365 app the first time after an Microsoft 365 installation because you have an older installation of Microsoft 365 which could be causing a conflict with your new install. Uninstall these versions of Microsoft 365 and try reinstalling Microsoft 365.
Check for an older installation of Office and uninstall it
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Right-click the Start button
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Search for older installs of Microsoft 365. This might be an Microsoft 365 suite, such as Office Home and Business on an individual app such as Word or Project.
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If you find an older version in the list of installed apps, uninstall it and then reinstall the version you do want following the steps below.
Uninstall Office
Use the uninstall troubleshooter to uninstall Microsoft 365, Office 2021, Office 2019, or Office 2016 from your Windows PC.
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Select the button below to start the uninstall troubleshooter.
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Click Open if you get a pop-up window indicating This site is trying to open Get Help.
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Follow the prompts on the remaining screens and when prompted, restart your computer.
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Select the steps for the version of Office you want to install or reinstall.
Microsoft 365 | Office 2024 | Office 2021 | Office 2019 | Office 2016
Important:
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The uninstall troubleshooter currently can't uninstall Office 2024.
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Run the troubleshooter on the same Windows PC with the Microsoft 365 or Office product you want to uninstall.
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You need to be on Windows 10 or higher to run the troubleshooter.
Tip: If the Microsoft 365 uninstall troubleshooter doesn't completely uninstall Microsoft 365 or Office from your PC, you can try to manually uninstall Office.
